import logging

from django.db import DatabaseError
from redis import RedisError
from rest_framework import status
from rest_framework.response import Response
from rest_framework.views import exception_handler as drf_exception_handler

logger=logging.getLogger('django')

def exception_handler(exc,context):
    '''
    自定义异常处理
    :param exc: 异常
    :param context: 抛出异常的上下文
    :return:
    '''
    # 调用DRF框架原生的异常处理方法
    response=drf_exception_handler(exc,context)
    logger.error('%s' % exc)

    # 如果处理失败,添加自己的处理逻辑
    if response is None:
        view=context['view']
        if isinstance(exc,DatabaseError) or isinstance(exc,RedisError):
            # 数据库异常
            logger.error('[%s] %s' %(view, exc))
            response=Response({'message':'服务器内部数据库错误'},status=status.HTTP_507_INSUFFICIENT_STORAGE)

    return response